Armstrong CD72SR Manuel utilisateur

CD72SR

Control Disc Steam Trap

Installation and Operation Manual

IOM-31-V1.0-EN

Please read and save

these instructions

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Designs, materials, weights and performance ratings are approximate and subject to change without notice. Visit armstronginternational.com for up-to-date information.

General Safety Information ........................ 3

Product Information ..................................... 3

Product Installation ...................................... 4

Maintenance Requirements ...................... 5

Trouble Shooting ......................................... 11

Repair Parts ................................................... 12

Table of Contents

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General Safety Information

This document should be used by an experienced person as a guide for installing the Armstrong

CD72SR Control Disc Steam Trap. Selection or installation of equipment should always be

accompanied by competent technical assistance. You are encouraged to contact Armstrong

International Inc., or its local sales representative for additional information.

Product Information

Armstrong CD72SR is a disc styled trap designed to control the trap’s cycle rate. The reduced

cycle rate provides Armstrong CD72SR trap with a longer service life than typical disc traps. This

enhanced performance ensures minimum maintenance time and reduced steam costs.

The capacity of Armstrong CD72SR has been engineered specically for the following

applications: large steam main drips, process equipments and HVAC heating equipments at

constant pressure.

Armstrong CD72SR is available in socket weld and screwed connections (anged connections

on request) for the maximum operating pressure range of 600psig@ 486°F (41.4 barg @ 252°C)

and in 1/2”, 3/4” and 1” (DN15, DN20, DN25) sizes.

Note:

• Minimum pressure for satisfactory operation is 5 psig (0.34 barg).

• Maximum back pressure should not exceed 80% of the inlet pressure. If back pressure

exceeds 80% of inlet pressure, the trap may not shut. At 50% to 70% back pressure traps

may become unstable. Therefore, Armstrong suggests limiting back pressure to 50% of inlet

pressure.

Product Installation

1. Before installing the trap, blow down the piping that leads to the trap’s inlet. Use full line

pressure. Be sure that the maximum operating pressure (PMO) of the trap is adequate for the

installation. (The PMO is stamped on the nameplate).

2. Install the trap inlet below the liquid level of the equipment to be drained. Make inlet piping as

short as possible. Use a minimum number of elbows and other restrictions in inlet and outlet

piping. Install a dirt pocket in the line ahead of the trap.

3. To allow for maintenance, install a valve on each side of the trap and a downstream testing

tee (unless test valve is used as the downstream valve). All valves should be full ported type to

avoid restricting ow.

4. If possible, install the trap in the horizontal position. For freeze-resistant applications, inlet

piping must be pitched towards the pipe for gravity ow. Additionally, the trap must be installed

vertically, discharging downward. Discharge piping must be self-draining.

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Maintenance Requirements

Wear progresses simultaneously on both the disc and the seating surfaces. Simply replacing the

disc is not sucient to repair a disc trap; both disc and seat must be renewed. In cases of minor

wear causing cycling, the disc may be replaced but the seat surfaces must also be lapped and/

or cleaned again to near atness. If a trap’s seat wear is deeper than .01 (0.25), it has progressed

beyond the depth of the hardened seat surface of most disc traps. If the seat is lapped at, the

softer material is exposed, and additional service life will be shortened. Theoretically the seats

may be lapped or machined, however, any alteration of the internal components of any disc trap

can change its operating characteristics. Armstrong does not recommend re-lapping the seating

area of the Series CD Controlled Disc Traps.

Seat and Disc replacement procedure

CAUTION: This set of instructions is for a complete replacement of repair kit including

cap. It may be noted that, during disassembly of the cap, the cap threads may get

damaged and may not seal properly as intended during reassembly. In such case, the

existing cap needs to be replaced with a new cap.

Please refer to torque requirements for sealing the cap in step no.10 of the “Seat and

Disc replacement procedure”.

DISASSEMBLY

1. Ensure that the pressure has been safely relieved and the trap is cooled out. Secure the trap

rmly with a vise with the cap facing upward.

2. Loosen the cap and unthread it by hand.

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3. Gently remove the seat, disc, three alignment pins and the inner gasket.

4. If the trap is to be rebuilt, inspect the top surfaces of the body (highlighted below) for steam

cutting, nicks, gouges or any other visible signs of damage. Also inspect the exposed

threads of the body for any damage.

Inspect surfaces

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REASSEMBLY

1. Firmly secure the trap body with a vise and exposed threads facing upwards.

2. Gently clean the surfaces on the seat and the body (as shown in pictures below) with a soft

damp cloth. Inspect the surfaces for any nicks, gouges or any other visible signs of damage.

CONTENTS OF REBUILD KIT

CAP - 1 NO.

(with name-plate embedded)

DISC - 1 NO. SEAT - 1 NO.

ALIGNMENT PINS - 3 NOS. INNER GASKET - 1 NO.

Clean and inspect surfaces

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3. Apply anti-seize paste to the cap threads on the body.

4. Place the alignment pins (3 nos.) and the inner gasket in th body as shown below:

5. Place the seat on the top of the body as shown below. Ensure that the alignment pins line up

with the holes in the bottom of the seat. Note that, when placed over the pins, the seat should

be free to move and small gap be visible between the seat and the body.

Anti-seize paste

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6. Gently clean the surface with a soft damp cloth as shown below. Inspect the surfaces fro any

nicks, gouges or any other visible signs of damage.

7. Place the disc on top of the seat. The groove in the disc should be facing downwards. Ensure

that the disc is centered on the seat.

8. Apply anti seize paste to the inside of the cap on the surface, spread out evenly. Do not

apply any other lubricant on the surface.

Clean and insect the surface.

Apply anti-seize paste

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Designs, materials, weights and performance ratings are approximate and subject to change without notice. Visit armstronginternational.com for up-to-date information.

9. Slowly slide the cap over the seat and disc. Gently thread the cap down by hand until it stops

and tighten it. Gently shake the trap and look for sound of disc moving inside the cap. Now

proceed to the next step. If the disc cannot be heard moving inside the cap, it may be caught

between the cap and the seat. Slowly remove the cap, recenter the disc on the top of seat and

gently re-tighten the cap by hand. Repeat this procedure until the disc can be heard moving

inside the cap.

10. Using a manual torque trench, tighten cap to 220lb-ft (300N-m). Never use an impact tool.

Troubleshooting

Problem Causes Solution

Steam Loss 1. Control disc damage

2. Seat damaged

Replace it.

No Condensate

Discharge.

1. Dirt or sediment in screen.

2. Screen damaged and scale lodged in

the passage.

3. Control disc or seat damaged.

1. Blowdown by pipe plug.

2. Replace the screen and

clean the passage.

3. Replace it

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armstronginternational.com

Designs, materials, weights and performance ratings are approximate and subject to change without notice. Visit armstronginternational.com for up-to-date information.

Repair Parts

To order for replacement of Control disc, Seat and Screen please specify the model details and the

size of the trap. For further assistance contact Armstrong representative.

The repair components and their respective part numbers are listed in the table below:

Model Size Control

Disc

Seat Gasket Cap Dowel

Name

plate &

screw

Screen Retainer Plug

CD72SR

1/2”

3/4”

1”

(DN15,

DN20,

DN25)

D96002 D96003 A8906 D96001

D96004

(3 nos.

per

piece)

D10932

A6091

A22290 D9198 D13834

Repair

Kit D107738 Not applicable

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